See attached Edmund Wilson's "The Pickeral Pond: A Double Pastoral." You will recognize [s]pot[s]/[s]top[s] and spider/redips. Alas, no "powder"/"red wop" or, for that matter, partizan/nazi trap. Still, this would seem to be proof enough of a friendly (I believe) homage to EW in "PF."
Oh, the poem is from a 1947 issue of the journal Furioso. I believe it was reprinted in EW's 1961 collection, Night Thoughts, though I haven't received that as yet.
Matt Roth